This achievement is unlocked during Case 5 - Fever Dreams
You will need to grab a star shaped key from the altar in front of you and take it too the left side wall.
You are tasked with recreating a complex celestial pattern. To do this you must join together the dots. While it starts off simple it becomes tougher and tougher and tougher
Tip - Start by using the middle star.
If you need further help, here is a link to a solution page. http://guides.gamepressure.com/sherlockholmesdevilsdaughter/...
The moment you connect the last dot the achievement will unlock.